The International Journal Of Engineering And Science (IJES) || Volume || 2 ||Issue|| 12 || Pages || 48-53 || 2013 || ISSN (e): 2319 – 1813 ISSN (p): 2319 – 1805
Enhancement of stability in multibus system using Static Synchronous Series Compensator (SSSC) Sangeetha C.N Department of Electrical and Electronics, SMEC
--------------------------------------------------------------ABSTRACT------------------------------------------------------In recent days most of the power system controlling techniques depends on the fast acting power electronic based FACTS Controllers. This paper describes a suitable approach to compensate the active and reactive power and also to damp out the oscillations in a multibus (six bus) power system using Static Synchronous Series Compensator (SSSC). The power system under consideration is simulated by using MATLAB/SIMULINK software. The dynamic Performance of SSSC is presented by voltage and current waveforms obtained for a selected bus in a six bus system.
Key words – Active and Reactive power, FACTS, Multibus system, Static Synchronous Series Compensator (SSSC) ---------------------------------------------------------------------------------------------------------------------------------------
Date of Submission: 30 November 2013
Date of Acceptance: 15 December 2013
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I.
INTRODUCTION
Nowadays the effective operation of the power transmission system is essential to meet the utility requirement, while still the system has to maintain reliability and security. Because of the uneven growth in power demand and lack of power generation facilities nowadays most of the power systems are interconnected. However the existing transmission systems are unavailable to meet the interconnected power system loads and this will lead to the variation in voltage profile and hence it will affect the stability of the system. The power flow through the AC transmission lines mainly depends on line impedance, the magnitude of the sending end voltage, the magnitude of the receiving end voltage and the phase angle between the sending and receiving end voltage. The power flow through the transmission line is increased by providing suitable reactive power compensation. In earlier days the transmittable power was increased by cancelling a portion of reactive line impedance by using series capacitive compensation. Most of the power systems are subjected to electromechanical oscillations. Power system stabilizers are used to eliminate these oscillations to some extent. Because of the implementation of fast acting power electronic based switching incorporated FACTS controllers, these oscillations damp out in high speed and thus improve the system stability. Many of the FACTS devices are connected in shunt or in series either without storage element or with storage element for effective compensation. In recent days series connected FACTS controllers such as SSSC is most suitable alternative means to damp out such electromechanical oscillations. The main component of SSSC is a voltage source converter (VSC) which injects an alternating voltage at fundamental frequency in series with the transmission line. The voltage injected by VSC is in quadrature with the line current due to this it can compensate both inductive as well as capacitive reactance, and thus influence the power flow through the transmission line . Generally SSSC is used to control the power flow through the transmission line, it can also be used for damping out the oscillations in transient mode and thus improve the transient stability. This paper describes how SSSC is used in a six bus system to improve the stability in transient mode.
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